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OK, I have a long, thin cube. I want to cut a spherical shape out of the bottom. Here is the cube and sphere:

enter image description here

Here's what happens when I add a boolean difference modifier to the cube, with the sphere as the target:

enter image description here

Here are my modifier settings:

enter image description here

Why does it just make the sphere fuzzy instead of removing the overlap from the cube? Why does something so simple have to be so frustrating?

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  • $\begingroup$ Blender Booleans are flaky sometimes, especially when the target objects share vertices, edges, or faces. Try 1) applying all scaling to both objects and 2) scaling the sphere cutter object slightly smaller so it falls completely within the Y axis of your cube. $\endgroup$ – zippy Sep 5 '20 at 3:02
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Booleans are very powerful tools but they are very picky about overlapping vertices and edges.

In this case you have a sphere with a top and bottom vertices which have a lot of connecting edges. Top vertex can be seen in attached image. Your boolean will break if the side of your object overlaps with any of these edges.

A sphere with a top vertex that has a lot of connecting edges.

You could change you sphere to a round cube which doesn't have similar vertices on top and bottom. (To add a round cube use an build-in add-on Add Mesh: Extra objects). Round cube is easier to align with your object. Just make sure none of the vertices and edges overlap.

A round cube.

No overlapping vertices

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